English verb conjugation
COULD SEMAPHORE

Regular verb: semaphore - semaphored - semaphored

Affirmation

Simple form	V-ing form
I could semaphore you could semaphore he could semaphore we could semaphore you could semaphore they could semaphore	I could be semaphoring you could be semaphoring he could be semaphoring we could be semaphoring you could be semaphoring they could be semaphoring
Perfect	V-ing perfect
I could have semaphored you could have semaphored he could have semaphored we could have semaphored you could have semaphored they could have semaphored	I could have been semaphoring you could have been semaphoring he could have been semaphoring we could have been semaphoring you could have been semaphoring they could have been semaphoring

Negation

Simple form	V-ing form
I couldn't semaphore you couldn't semaphore he couldn't semaphore we couldn't semaphore you couldn't semaphore they couldn't semaphore	I couldn't be semaphoring you couldn't be semaphoring he couldn't be semaphoring we couldn't be semaphoring you couldn't be semaphoring they couldn't be semaphoring
Perfect	V-ing perfect
I couldn't have semaphored you couldn't have semaphored he couldn't have semaphored we couldn't have semaphored you couldn't have semaphored they couldn't have semaphored	I couldn't have been semaphoring you couldn't have been semaphoring he couldn't have been semaphoring we couldn't have been semaphoring you couldn't have been semaphoring they couldn't have been semaphoring

Interrogative form

Simple form	V-ing form
could I semaphore? could you semaphore? could he semaphore? could we semaphore? could you semaphore? could they semaphore?	could I be semaphoring? could you be semaphoring? could he be semaphoring? could we be semaphoring? could you be semaphoring? could they be semaphoring?
Perfect	V-ing perfect
could I have semaphored? could you have semaphored? could he have semaphored? could we have semaphored? could you have semaphored? could they have semaphored?	could I have been semaphoring? could you have been semaphoring? could he have been semaphoring? could we have been semaphoring? could you have been semaphoring? could they have been semaphoring?

Interro-negative form

Simple form	V-ing form
couldn't I semaphore? couldn't you semaphore? couldn't he semaphore? couldn't we semaphore? couldn't you semaphore? couldn't they semaphore?	couldn't I be semaphoring? couldn't you be semaphoring? couldn't he be semaphoring? couldn't we be semaphoring? couldn't you be semaphoring? couldn't they be semaphoring?
Perfect	V-ing perfect
couldn't I have semaphored? couldn't you have semaphored? couldn't he have semaphored? couldn't we have semaphored? couldn't you have semaphored? couldn't they have semaphored?	couldn't I have been semaphoring? couldn't you have been semaphoring? couldn't he have been semaphoring? couldn't we have been semaphoring? couldn't you have been semaphoring? couldn't they have been semaphoring?